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Deconvolution of detector size effect for small field measurement
Author(s) -
Higgins Patrick D.,
Sibata Claudio H.,
Siskind Lisa,
Sohn Jason W.
Publication year - 1995
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.597427
Subject(s) - detector , deconvolution , artifact (error) , dosimetry , optics , parametrization (atmospheric modeling) , beam (structure) , physics , volume (thermodynamics) , enhanced data rates for gsm evolution , materials science , computational physics , computer science , nuclear medicine , computer vision , medicine , radiative transfer , quantum mechanics
Parametrization of the small fields employed in stereotactic applications is a painstaking process involving extensive film dosimetry to achieve acceptable beam edge definition. Use of cylindrical or spherical detectors for profile measurements would simplify data acquisition but add a volume averaging artifact to beam edge definition. We demonstrate a simple approach to unfolding the chamber size artifact from measured small beam profiles using typical cylindrical chambers. In comparison with film measurements we have found good agreement when the detector response function is deconvoluted from the measured profiles, although the amount of correction needed is fairly minimal for the detectors studied.